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Grid interfacing-converter-systems

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Leonardo ENERGY
Leonardo ENERGY
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Grid-Interfacing Converter Systems with Enhanced Voltage Quality Fei Wang
Contents ,[object Object],[object Object],[object Object],[object Object],[object Object]
Transition to the future grid ,[object Object],[object Object],[object Object],[object Object]
Conventional electricity grid ,[object Object],[object Object],[object Object],Generation Transmission Distribution Loads
Voltage quality problems ,[object Object],[object Object],[object Object],[object Object],Generation Transmission Distribution Loads
Distributed generation in the grid Energy Storages Distributed Generation Distribution networks Grid-interfacing converters
Path to the future grid
Path to the future grid
Series-parallel grid-interfacing systems ,[object Object]
Series-parallel grid-interfacing systems ,[object Object]
Series-parallel grid-interfacing systems ,[object Object]
Series-parallel grid-interfacing systems ,[object Object],[object Object]
Reconfiguring system functionalities ,[object Object],[object Object],[object Object]
Reconfiguring system functionalities ,[object Object],[object Object],[object Object],[object Object],[object Object]
Reconfiguring system functionalities ,[object Object],[object Object],[object Object],[object Object],[object Object]
Comparison with shunt systems ,[object Object],[object Object]
Control design and implementation ,[object Object]
Control design and implementation ,[object Object],[object Object],[object Object]
Control design – parallel converter ,[object Object]
Control design – parallel converter ,[object Object],Bode plots of the plant transfer function Feedforward loop
Control design – parallel converter ,[object Object],Bode plots of the open-loop transfer function with multiple PR controllers Multiple PR controllers
Control design – parallel converter ,[object Object],System sensitivity to current disturbances Inner current feedback loop
Control design – series converter ,[object Object]
Control design – series converter Inverter output voltage to feedback current when Bode plots of open-loop transfer function
Laboratory system
Experimental results ,[object Object],[object Object],(a) WITHOUT low-order harmonic compensation (b) WITH low-order harmonic compensation
Experimental results ,[object Object],Frequency spectra of the phase current Series-converter current Injected series voltage
Experimental results ,[object Object],Distorted grid voltage (6.7%THD) Output voltage of the series-converter Output voltage of the parallel converter Currents delivered to the grid
Experimental results ,[object Object],Grid voltage (phase a & b dip to 80%) Output voltage of the series-converter Output voltage of the parallel converter Currents delivered to the grid
Conclusions and recommendations ,[object Object],[object Object],[object Object],[object Object]
References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Grid interfacing-converter-systems

Notes de l'éditeur

  1. Situations/Problems of existing grids; driving to the next generation of grid; before that, take a look the existing grid
  2. Situations/Problems of existing grids; driving to the next generation of grid; before that, take a look the existing grid
  3. Depends on large central power stations; centralized control; unidirectional; Difficult to upgrade the existing grid due to increasing power demand; Context: current flow through the feeder and transformer impedance introduce voltage drop, ant that means voltage appearing at the user sides can be shaped/influenced by the current.
  4. Voltage quality problems, steady-state ones and transient ones; main features in the grid and conventional solutions; fluctuations (including voltage and frequency) Context: can be even worse due to the change of existing grid
  5. Flexible operation; Bottom-up solutions Flexibility, complexity, reliability, quality …… concepts, ideas, detailed power electronic control, implementations… Context: a smart operation of a future grid can be complex, but also must be smartly organized so as to achieve smart and flexible control, some concepts have been proposed, and what we proposed?
  6. Converter systems with enhanced voltage quality basic electricity energy delivery from DG to the grid integrate previously proposed control and solutions protect local system from grid disturbances power flow control under disturbed situations for grid support